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ADTRAN Holdings, Inc. (ADTN) SEC Filings | Global Financial Data

ADTRAN Holdings, Inc.

ADTNSEC EDGAR

Telephone & Telegraph ApparatusCIK: 926282

PRE 14A

Filed: Mar 13, 2026 | Report: Mar 13, 2026

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Filed: Mar 5, 2026 | Report: Mar 4, 2026

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4/A

Filed: Mar 5, 2026 | Report: Jan 24, 2025

Filed: Feb 26, 2026 | Report: Dec 31, 2025

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8-K

Filed: Feb 26, 2026 | Report: Feb 25, 2026

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4/A

Filed: Jan 30, 2026 | Report: Jan 26, 2026

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Filed: Jan 28, 2026 | Report: Jan 26, 2026

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Filed: Jan 28, 2026 | Report: Jan 26, 2026

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Filed: Jan 27, 2026 | Report: Jan 24, 2026

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Filed: Jan 27, 2026 | Report: Jan 24, 2026

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Filed: Jan 22, 2026 | Report: Jan 20, 2026

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Filed: Jan 22, 2026 | Report: Jan 20, 2026

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8-K

Filed: Jan 22, 2026 | Report: Jan 21, 2026

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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Filed: Jan 5, 2026 | Report: Dec 31, 2025

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8-K

Filed: Dec 11, 2025 | Report: Dec 9, 2025

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Filed: Dec 1, 2025 | Report: Nov 28, 2025

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Filed: Dec 1, 2025 | Report: Nov 26, 2025

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Filed: Nov 25, 2025 | Report: Nov 24, 2025

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Filed: Nov 19, 2025 | Report: Nov 17, 2025

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Filed: Nov 19, 2025 | Report: Nov 17, 2025

Filed: Nov 4, 2025 | Report: Sep 30, 2025

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8-K

Filed: Nov 4, 2025 | Report: Nov 3, 2025

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8-K

Filed: Sep 22, 2025 | Report: Sep 19, 2025

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8-K

Filed: Sep 17, 2025 | Report: Sep 15, 2025

Filed: Aug 5, 2025 | Report: Jun 30, 2025

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8-K

Filed: Aug 5, 2025 | Report: Aug 4, 2025

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8-K

Filed: Jul 30, 2025 | Report: Jul 24, 2025

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8-K/A

Filed: Jul 17, 2025 | Report: Jul 16, 2025

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8-K

Filed: Jul 16, 2025 | Report: Jul 16, 2025

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Filed: Jul 15, 2025 | Report: Jul 13, 2025

Filed: Jun 30, 2025 | Report: Dec 31, 2024

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ARS/A

Filed: Jun 6, 2025 | Report: Dec 31, 2024

Filed: May 28, 2025 | Report: May 27, 2025

Filed: May 27, 2025 | Report: May 27, 2025

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10-Q

Filed: May 20, 2025 | Report: Mar 31, 2025

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10-K/A

Filed: May 20, 2025 | Report: Dec 31, 2024

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